高级API,第二章章节练习

第一题

 

package com.kgc.zjlx.zj2.zj201;

import java.util.Scanner;

public class Test {
    Scanner sc = new Scanner(System.in);

    public void shuru() {
        String str;
        do {
            System.out.println("请输入长度为6的字符串:");
            str=sc.next();
        } while (str.length()!= 6);
        System.out.println("程序退出了,您输入了:"+str);
    }


    public static void main(String[] args) {
        new Test().shuru();
    }
}

 

运行结果

 

 

第二题

 

package com.kgc.zjlx.zj2.zj202;
/**
 * 对录入的信息进行有效的验证
 */

import java.util.Scanner;

public class Date {
    Scanner sc = new Scanner(System.in);

    //判断传入的字符数量
    public int counter(String str, char c) {
        int counter = 0;
        for (int i = 0; i < str.length(); i++) {
            char ch = str.charAt(i);
            if (ch == c) {
                counter++;
            }
        }
        return counter;
    }

    //判断日期格式
    public void test() {
        int yf1 = 0;
        int ri1 = 0;
        Scanner sc = new Scanner(System.in);
        while (true) {
            System.out.print("请输入会员生日<月/日 00/00>:");
            String str = sc.next();
            int i = counter(str, '/');//判断个数
            if (i == 1) {
                int a = str.indexOf('/');
                String yf = str.substring(0, a);
                String ri = str.substring(a + 1, str.length());
                try {
                    yf1 = Integer.parseInt(yf);
                    ri1 = Integer.parseInt(ri);
                } catch (NumberFormatException e) {
                    System.err.println("非法输入字符");
                    continue;
                }
                if (yf1 <= 0 || yf1 > 12 || ri1 <= 0 || ri1 > 31) {
                    System.out.println("日期超出范围了");
                } else {
                    System.out.println("该会员生日是:" + str);
                    break;
                }
            } else {
                System.out.println("输入的格式错误");
            }
        }
    }

    //设置密码
    public void password() {
        String password;
        do {
            System.out.print("请输入会员密码<6-10位>:");
            password = sc.next();
        } while (!(password.length() > 5 && password.length() < 11));
        System.out.println("该会员的密码是:" + password);
    }

    public static void main(String[] args) {
        Date date = new Date();
        date.test();
        date.password();
    }
}

 

运行结果

 

 

第三题

 

package com.kgc.zjlx.zj2.zj203;

import java.util.Random;
import java.util.Scanner;

public class Test {
    public static void main(String[] args){
        Scanner sc=new Scanner(System.in);
        Random rd=new Random();
        Mamber mb=new Mamber();

        System.out.print("请输入会员姓名:");
        mb.setName(sc.next());
        System.out.print("请输入会员性别:");
        mb.setSex(sc.next());
        System.out.print("请输入会员年龄:");
        mb.setAge(sc.nextInt());

        System.out.println("创建会员成功!");
        System.out.println("会员编号:"+rd.nextInt(9999));
        System.out.println("会员详细信息:");
        System.out.println(mb.getName()+"\t"+mb.getSex()+"\t"+mb.getAge());
    }
}

 

运行结果